CN116909197A - MBUS signal conversion module and conversion method for multi-type water meter acquisition - Google Patents
MBUS signal conversion module and conversion method for multi-type water meter acquisition Download PDFInfo
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention discloses an MBUS signal conversion module and a conversion method for multi-type water meter acquisition, which belong to the technical field of MBUS host acquisition and comprise the following steps: the acquisition front-end circuit is used for converting the acquired MBUS current signal into a voltage signal; the singlechip circuit is used for generating a reference voltage; the conditioning circuit is used for filtering the voltage signal of the acquisition front-end circuit and filtering the interference signal; the demodulation circuit is used for comparing the reference voltage generated by the singlechip with the voltage signal filtered by the conditioning circuit to generate a TTL signal; the conversion circuit is used for demodulating the received 485 signal of the 485 bus into a TTL signal, converting the TTL signal of the demodulation circuit into the 485 signal and transmitting the 485 signal to the 485 bus; the MBUS signal conversion module and the conversion method for the multi-type water meter acquisition are connected with any 485 acquisition host, collect water meters of different factories and realize the acquisition of up to 256 water meters by one bus.
Description
Technical Field
The invention belongs to the technical field of MBUS host acquisition, and particularly relates to an MBUS signal conversion module and a conversion method for multi-type water meter acquisition.
Background
Currently, the MBUS meter of a meter manufacturer does not follow the MBUS protocol, so that the MBUS signal of the meter is wonderful, for example, the MBUS protocol prescribes that the logic level 1 is 1.5MA and the logic level 0 is 11-20MA, but the logic level 0 of the meter of some manufacturers is 30-50MA, if the host acquisition module adopts a sampling filtering mode, the TTL signal is difficult to demodulate, if the voltage after latching and transmitting is adopted, the voltage is compared, the signal received by some meters is immediately transmitted to 0, the meters cannot be acquired, different circuits are designed for different meters, and the waste of materials and time in the aspects of production and after sale is avoided, so that the MBUS signal conversion module and the conversion method for acquiring the multi-type meters are required to be developed to solve the existing problems.
Disclosure of Invention
The invention aims to provide an MBUS signal conversion module and a MBUS signal conversion method for multi-type water meter acquisition, so as to solve the problem that unified acquisition cannot be realized due to inconsistent signals of different brands of water meters.
In order to achieve the above purpose, the present invention provides the following technical solutions: MBUS signal conversion module that many types of water meters gathered includes:
the acquisition front-end circuit is used for converting the acquired MBUS current signal into a voltage signal;
the singlechip circuit is used for generating a reference voltage;
the conditioning circuit is used for filtering the voltage signal of the acquisition front-end circuit and filtering the interference signal;
the demodulation circuit is used for comparing the reference voltage generated by the singlechip with the voltage signal filtered by the conditioning circuit to generate a TTL signal;
the conversion circuit is used for demodulating the received 485 signal of the 485 bus into a TTL signal, converting the TTL signal of the demodulation circuit into the 485 signal and transmitting the 485 signal to the 485 bus;
the MBUS transmitting circuit is used for converting the TTL signal of the converting circuit into an MBUS signal and transmitting the MBUS signal to the MBUS bus;
and the deadlock prevention circuit is used for monitoring the voltage of the demodulation circuit, and if the voltage is low level, the conversion circuit is in a receiving state.
Preferably, the MBUS transmitting circuit includes: transistor Q1, transistor Q2, transistor Q3, transistor Q4, transistor Q5, zener diode D2, resistor R13, resistor R6, resistor R2, resistor R17, resistor R10, and thermistor R7;
the triode Q4 is respectively connected with one end of a resistor R13, one end of a resistor R6 and one end of a resistor R10, the other end of the resistor R10 is connected with a triode Q5, the triode Q5 is respectively connected with one end of a resistor R17 and one end of a zener diode D2, the other end of the zener diode D2 is connected with a triode Q3, the triode Q3 is connected with a thermistor R7 and a triode Q1, and the triode Q1 is connected with the resistor R2 in parallel; the other end of the resistor R13 is connected with a conversion circuit.
Preferably, the conversion circuit includes: 485 chip U2 for realizing the mutual conversion of TTL signal and 485 signal and triode Q6 connected with 485 chip U2.
Preferably, the RE pin and the DE pin of the 485 chip U2 are connected with a resistor R9 and a triode Q6, the triode Q6 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a resistor R21 and the D pin of the 485 chip U2;
the VCC pin of the 485 chip U2 is connected with the capacitor C1;
the A pin and the B pin of the 485 chip U2 are connected with a transistor V1, a resistor R11 and a resistor R5, and the transistor V1 is also connected with a diode D1, a diode D3, a self-recovery fuse BX1 and a self-recovery fuse BX2.
Preferably, the singlechip circuit detects an MBUS signal of the conditioning circuit to generate a comparison voltage value required by the demodulation circuit, and after the singlechip detects the current signal of the MBUS, the singlechip circuit samples the MBUS signal of one period to obtain a median value of the acquired voltage, and generates reference voltages required by the conditioning circuit and the demodulation circuit according to the median value of the acquired voltage.
Preferably, the TTL transmitting signal generated by the conversion circuit is connected to the MBUS transmitting circuit through a wire, and the receiving signal of the conversion circuit is connected to the demodulation circuit through a wire.
Preferably, the monolithic circuit includes:
MCU；
the VCC pin of MCU is connected with electric capacity C5, the PF4 pin of MCU is connected with resistance R22, the PF2 pin of MCU connects resistance R20 and electric capacity C11.
Preferably, the negative electrode of the acquisition front-end circuit is connected to the ground in series through a resistor.
Preferably, the acquisition front-end circuit comprises a resistor R16, a capacitor C6 and a diode D5;
the conditioning circuit includes: resistor R14, capacitor C7, resistor R15, capacitor C8, resistor R1, operational amplifier U1B, resistor R4, capacitor C3, resistor R3 and capacitor C2;
the operational amplifier U1B one end is connected with resistance R1, electric capacity C2, resistance R3 one end, resistance R3's the other end is connected with resistance R4 and electric capacity C3, resistance R1's the other end is connected with electric capacity C6, parallelly connected diode D5 and resistance R16, electric capacity C7, electric capacity C8 on the electric capacity C6, be provided with resistance R14 between resistance R16 and the electric capacity C7, just be connected with resistance R15 between electric capacity C7 and the electric capacity C8, resistance R15 still is connected with diode D4.
The invention further provides a conversion method of the MBUS signal conversion module for multi-type water meter acquisition, which comprises the following steps:
and a transmitting step:
when 485 signal data is received by the 485 bus, the 485 signal data is converted into a TTL signal, and the TTL signal is transmitted to the MBUS bus through the MBUS transmitting circuit;
485 signal conversion:
after receiving the MBUS signal on the MBUS bus, the receiving circuit of the conditioning circuit converts the MBUS signal into a TTL signal, converts the TTL signal into a 485 signal through a 485 chip and sends the 485 signal to the 485 bus;
in the transmitting step, after receiving the data on the 485 bus, the data is converted into a TTL signal through a conversion circuit, namely the data on the 485 bus enters a A, B pin of a 485 chip through a self-recovery fuse BX1 and a self-recovery fuse BX2, and the 485 chip converts the 485 signal into the TTL signal; the TTL signal is amplified after passing through a resistor R3 and a triode Q4 of the MBUS transmitting circuit, and then is transmitted to the MBUS bus after passing through a triode Q5, a diode D2, a triode Q3 and a triode Q7;
in 485 signal conversion step, when MBUS bus has data, firstly enter the acquisition front-end circuit, the acquisition front-end circuit converts MBUS current signal into voltage signal, the conditioning circuit filters the voltage signal of the acquisition front-end circuit, the demodulation circuit converts MBUS signal into TTL signal, and TTL signal is converted into 485 signal through the conversion circuit.
The invention has the technical effects and advantages that: according to the MBUS signal conversion module and the conversion method for the multi-type water meter, the collected MBUS signals are converted into 485 signals, connection with any 485 collection host is realized, water meters of different manufacturers are collected, collection of up to 256 water meters on one bus is realized, meanwhile, a deadlock prevention circuit is realized, and 485 is converted into a receiving state after reference voltage required by a conditioning demodulation circuit produced by a singlechip is in error, so that deadlock is avoided; the problem that signals of different brands of water meters are inconsistent and cannot be collected uniformly is solved, different circuits are not required to be designed for different water meters, the production cost is saved, and the after-sale time is saved.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a schematic diagram of an MBUS transmit circuit of the present invention;
FIG. 3 is a schematic diagram of a conditioning circuit according to the present invention;
FIG. 4 is a schematic diagram of a conversion circuit according to the present invention;
FIG. 5 is a schematic diagram of a single-chip microcomputer circuit according to the present invention;
FIG. 6 is a top view of the housing of the present invention;
fig. 7 is a front view of the housing of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an MBUS signal conversion module for multi-type water meter acquisition as shown in figure 1, which adopts a singlechip to acquire voltage signals of a conditioning circuit in real time, so as to generate reference voltage required by a demodulation circuit and ensure that various signals can be demodulated; comprising the following steps: the MBUS transmitting circuit comprises a deadlock prevention circuit, a singlechip circuit, a conditioning circuit, an acquisition front-end circuit, a demodulation circuit and a conversion circuit; the MBUS transmitting circuit converts TTL signals of the converting circuit into MBUS signals and transmits the MBUS signals;
the acquisition front-end circuit converts the current signal of the MBUS into a voltage signal; in the embodiment, the cathodes of the receiving circuits of the acquisition front-end circuit and the conditioning circuit are connected in series to the ground through resistors; the conditioning circuit filters the voltage signal of the acquisition front-end circuit, filters the interference signal to leave useful signals and sends the useful signals to the singlechip, in the embodiment, the acquisition front-end circuit is connected with the conditioning circuit through a lead, the singlechip acquires MBUS signals to generate reference voltage, and the demodulation circuit compares the reference generated by the singlechip with the voltage generated by the conditioning circuit after filtering to generate a receiving signal of TTL (transistor-transistor logic) and sends the receiving signal to the conversion circuit part; in the embodiment, the reference voltage of the conditioning circuit and the demodulation circuit is generated by a singlechip DAC, and the connection relationship is that the reference voltage is connected through a 1K resistor; the singlechip is responsible for generating reference voltage and collecting voltage signals of the conditioning circuit, the voltage signals of the conditioning circuit are connected through a resistor, the anti-deadlock circuit monitors the demodulated voltage, and when the voltage is always low, the conversion circuit is controlled to enable the module to be in a receiving state, so that deadlock is avoided; the conversion circuit is responsible for transmitting and receiving of two protocols; in this embodiment, the TTL transmitting signal wire generated by the conversion circuit is connected to the MBUS transmitting circuit, and the receiving signal is connected to the demodulation circuit through the wire;
as shown in fig. 6 and 7, for the size and the wiring mode of the shell, a 9-36V power supply interface, a 485 communication interface and an MBUS communication interface are respectively provided;
the MBUS emitting circuit shown in fig. 2 is composed of a triode, a zener diode, a resistor and a thermistor, specifically a triode Q1, a triode Q2, a triode Q3, a triode Q4, a triode Q5, a zener diode D2, a resistor R13, a resistor R6, a resistor R2, a resistor R17, a resistor R10 and a thermistor R7;
the triode Q4 is respectively connected with one end of a resistor R13, one end of a resistor R6 and one end of a resistor R10, the other end of the resistor R10 is connected with a triode Q5, the triode Q5 is respectively connected with one end of a resistor R17 and one end of a zener diode D2, the other end of the zener diode D2 is connected with a triode Q3, the triode Q3 is connected with a thermistor R7 and a triode Q1, and the triode Q1 is connected with the resistor R2 in parallel; the other end of the resistor R13 is connected with a conversion circuit;
when a 485 signal on a 485 bus is received, the 485 signal is converted into a TTL signal through a 485 chip, the TTL signal UART2_RX enters a triode Q4 after passing through a resistor R13, the transmitting pin of the TTL signal UART2_RX is at a level with high and low variation, the level controls the high and low level variation of the collector electrode of the triode Q4, the triode Q4 controls the collector electrode of a triode Q5, and the variation of the triode Q5, so that an MBUS signal is generated on a thermistor R7;
the conditioning circuit is shown in fig. 3, and the collecting front-end circuit is composed of a resistor R16, a capacitor C6 and a diode D5, converts an MBUS current signal into a voltage signal, and the resistor R14, the capacitor C7, the resistor R15 and the capacitor C8 form the conditioning circuit and are responsible for filtering the voltage signal of the collecting front-end circuit; the receiving circuit of the conditioning circuit consists of a resistor R1, an operational amplifier U1B, a resistor R4, a capacitor C3, a resistor R3 and a capacitor C2, PWM is generated by a singlechip, and the PWM is converted into voltage through the resistor R4, the capacitor C3, the resistor R3 and the capacitor C2 to demodulate the transmitted data of the water meter MBUS;
as shown in fig. 4, the conversion circuit is composed of a 485 chip and a triode, and the 485 chip realizes the mutual conversion between TTL and 485 signals;
RE and DE pins of the 485 chip U2 are connected with a resistor R9 and a triode Q6, the triode Q6 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a resistor R21 and a D pin of the 485 chip U2;
the VCC pin of the 485 chip U2 is connected with the capacitor C1;
the pin A and the pin B of the 485 chip U2 are connected with a transistor V1, a resistor R11 and a resistor R5, and the transistor V1 is also connected with a diode D1, a diode D3, a self-recovery fuse BX1 and a self-recovery fuse BX2;
fig. 5 illustrates a single-chip microcomputer circuit, wherein the single-chip microcomputer circuit is a single-chip microcomputer minimum system, and the single-chip microcomputer circuit includes:
MCU；
the VCC pin of the MCU is connected with the capacitor C5, the PF4 pin of the MCU is connected with the resistor R22, and the PF2 pin of the MCU is connected with the resistor R20 and the capacitor C11; the MCU leads out an ADC pin, detects an MBUS signal of the conditioning circuit, and generates a reference voltage value required by the demodulation circuit, wherein the internal algorithm is that after the singlechip detects the MBUS current signal, after sampling the MBUS signal of one period, a median value of the acquired voltage is obtained, and the reference voltage required by the conditioning demodulation circuit is generated according to the median value of the acquired voltage.
The invention further provides a conversion method of the MBUS signal conversion module for multi-type water meter acquisition, which comprises the following steps:
collecting MBUS current signals and converting the MBUS current signals into voltage signals;
filtering the voltage signal, filtering the interference signal to leave a useful signal, and sending the useful signal to the singlechip, wherein the singlechip generates reference voltage, the demodulation circuit compares the reference voltage generated by the singlechip with the voltage generated by the filtering of the conditioning circuit to generate a TTL receiving signal, and sending the TTL receiving signal to the conversion circuit, and the conversion circuit sends and receives two protocols;
the demodulated voltage is monitored, and when the voltage is always at a low level, the switching circuit is controlled to be in a receiving state.
And a transmitting step:
when the 485 bus receives 485 signal data, the 485 signal data is transmitted to the MBUS bus through a TTL-to-MBUS transmitting circuit;
485 signal conversion:
after receiving the MBUS signal on the MBUS bus, the receiving circuit of the conditioning circuit converts the MBUS signal into a TTL signal, converts the TTL signal into a 485 signal through a 485 chip and sends the 485 signal to the 485 bus;
the specific embodiment of the transmitting step is that after the module receives the data on the 485 bus, the data is converted into TTL signals through a conversion circuit, and the circuit is shown in figure 4, namely, the data on the 485 bus enters a A, B pin of a 485 chip through self-recovery fuses BX1 and BX2, and the 485 chip converts the 485 signals into TTL signals; the TTL signal is amplified after passing through a resistor R3 and a triode Q4 of the MBUS transmitting circuit in FIG. 2, and then is transmitted to the MBUS bus after passing through a triode Q5, a diode D2, a triode Q3 and a triode Q7;
the specific implementation of the 485 signal conversion step is that when the MBUS bus has data, the data firstly enters an MBUS acquisition front-end circuit, as shown in fig. 3, the acquisition front-end circuit converts an MBUS current signal into a voltage signal, the voltage signal passes through a conditioning circuit and then passes through a demodulation circuit, PWM is generated by a singlechip, the voltage is converted into voltage through a resistor R4, a capacitor C3 resistor R3 and a capacitor C2 to demodulate the transmitted data of the water meter MBUS, the data is converted into TTL data after passing through the demodulation circuit, the data is converted into 485 signals through a 485 circuit, the conversion circuit is composed of a 485 chip and a triode as shown in fig. 4, and the 485 chip realizes the mutual conversion of the TTL and the 485 signals;
the MBUS signal conversion module and the conversion method for the multi-type water meter acquisition are connected with any 485 acquisition host, collect water meters of different factories, collect up to 256 water meters on one bus, and meanwhile, the deadlock prevention circuit is used for converting 485 into a receiving state after a reference voltage required by a conditioning demodulation circuit produced by a singlechip is wrong, so that deadlock is avoided; the problem that signals of different brands of water meters are inconsistent and cannot be collected uniformly is solved, different circuits are not required to be designed for different water meters, the production cost is saved, and the after-sale time is saved.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. MBUS signal conversion module that many types of water meters gathered, its characterized in that: comprising the following steps:
the acquisition front-end circuit is used for converting the acquired MBUS current signal into a voltage signal;
the singlechip circuit is used for generating a reference voltage;
the conditioning circuit is used for filtering the voltage signal of the acquisition front-end circuit and filtering the interference signal;
the demodulation circuit is used for comparing the reference voltage generated by the singlechip with the voltage signal filtered by the conditioning circuit to generate a TTL signal;
the conversion circuit is used for demodulating the received 485 signal of the 485 bus into a TTL signal, converting the TTL signal of the demodulation circuit into the 485 signal and transmitting the 485 signal to the 485 bus;
the MBUS transmitting circuit is used for converting the TTL signal of the converting circuit into an MBUS signal and transmitting the MBUS signal to the MBUS bus;
and the deadlock prevention circuit is used for monitoring the voltage of the demodulation circuit, and if the voltage is low level, the conversion circuit is in a receiving state.
2. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the MBUS transmitting circuit comprises: transistor Q1, transistor Q2, transistor Q3, transistor Q4, transistor Q5, zener diode D2, resistor R13, resistor R6, resistor R2, resistor R17, resistor R10, and thermistor R7;
the triode Q4 is respectively connected with one end of a resistor R13, one end of a resistor R6 and one end of a resistor R10, the other end of the resistor R10 is connected with a triode Q5, the triode Q5 is respectively connected with one end of a resistor R17 and one end of a zener diode D2, the other end of the zener diode D2 is connected with a triode Q3, the triode Q3 is connected with a thermistor R7 and a triode Q1, and the triode Q1 is connected with the resistor R2 in parallel; the other end of the resistor R13 is connected with a conversion circuit.
3. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the conversion circuit includes: 485 chip U2 for realizing the mutual conversion of TTL signals and 485 signals and triode Q6 connected with 485 chip U2.
4. The MBUS signal conversion module for multi-type water meter collection according to claim 3, wherein: RE and DE pins of the 485 chip U2 are connected with a resistor R9 and a triode Q6, the triode Q6 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a resistor R21 and a D pin of the 485 chip U2;
the VCC pin of the 485 chip U2 is connected with the capacitor C1;
the A pin and the B pin of the 485 chip U2 are connected with a transistor V1, a resistor R11 and a resistor R5, and the transistor V1 is also connected with a diode D1, a diode D3, a self-recovery fuse BX1 and a self-recovery fuse BX2.
5. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the single chip microcomputer circuit detects the MBUS signal of the conditioning circuit and generates a comparison voltage value required by the demodulation circuit, after the single chip microcomputer circuit detects the MBUS current signal, the single chip microcomputer circuit samples the MBUS signal of one period to obtain a median value of the acquired voltage, and the reference voltages required by the conditioning circuit and the demodulation circuit are generated according to the median value of the acquired voltage.
6. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the TTL signal generated by the conversion circuit is connected to the MBUS transmitting circuit through a wire, and the receiving signal of the conversion circuit is connected to the demodulation circuit through a wire.
7. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the monolithic circuit includes:
MCU；
the VCC pin of MCU is connected with electric capacity C5, the PF4 pin of MCU is connected with resistance R22, the PF2 pin of MCU connects resistance R20 and electric capacity C11.
8. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the negative electrode of the acquisition front-end circuit is connected to the ground in series through a resistor.
9. The MBUS signal conversion module for multi-type water meter collection of claim 1, wherein: the acquisition front-end circuit comprises a resistor R16, a capacitor C6 and a diode D5;
the conditioning circuit includes: resistor R14, capacitor C7, resistor R15, capacitor C8, resistor R1, operational amplifier U1B, resistor R4, capacitor C3, resistor R3 and capacitor C2;
the operational amplifier U1B one end is connected with resistance R1, electric capacity C2, resistance R3 one end, resistance R3's the other end is connected with resistance R4 and electric capacity C3, resistance R1's the other end is connected with electric capacity C6, parallelly connected diode D5 and resistance R16, electric capacity C7, electric capacity C8 on the electric capacity C6, be provided with resistance R14 between resistance R16 and the electric capacity C7, just be connected with resistance R15 between electric capacity C7 and the electric capacity C8, resistance R15 still is connected with diode D4.
10. A conversion method of an MBUS signal conversion module based on multi-type water meter acquisition according to any one of claims 4-9, characterized in that: comprising the following steps:
and a transmitting step:
when 485 signal data is received by the 485 bus, the 485 signal data is converted into a TTL signal, and the TTL signal is transmitted to the MBUS bus through the MBUS transmitting circuit;
485 signal conversion:
after receiving the MBUS signal on the MBUS bus, the receiving circuit of the conditioning circuit converts the MBUS signal into a TTL signal, converts the TTL signal into a 485 signal through a 485 chip and sends the 485 signal to the 485 bus;
in the transmitting step, after receiving the data on the 485 bus, the data is converted into a TTL signal through a conversion circuit, namely the data on the 485 bus enters a A, B pin of a 485 chip through a self-recovery fuse BX1 and a self-recovery fuse BX2, and the 485 chip converts the 485 signal into the TTL signal; the TTL signal is amplified after passing through a resistor R3 and a triode Q4 of the MBUS transmitting circuit, and then is transmitted to the MBUS bus after passing through a triode Q5, a diode D2, a triode Q3 and a triode Q7;
in 485 signal conversion step, when MBUS bus has data, firstly enter the acquisition front-end circuit, the acquisition front-end circuit converts MBUS current signal into voltage signal, the conditioning circuit filters the voltage signal of the acquisition front-end circuit, the demodulation circuit converts MBUS signal into TTL signal, and TTL signal is converted into 485 signal through the conversion circuit.
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| CN116909197B (en) | 2024-01-05 |
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